I believe there is a fairly simple reason why we are being told that even though you have been vaccinated, that you should still continue to wear a mask and practice social distancing.
They can not have one group exempt from the mandated or recommended rules. "All people in this plane must wear a mask, except those people who have been vaccinated." That would be impossible to enforce. Therefore, if you still should wear a mask after you get vaccinated, they have no problem. "Everyone must wear a mask on the plane." It is simply a matter of making the enforcement of the current mandates continue to be possible.
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